Lisa Seeto authored Nov 10, 2020 and Robert Lyon committed Jun 08, 2021

Change Image gallery block config modal:
 - remove photobucket, picasa, flicker, windowslive options
 - remove 'width' option
 - remove 'display from external gallery' option
 - remove 'thumbnails' option (only use slideshow or thumbnails (square))
 - remove 'use photo frame' option

Remove .tpl's for decommissioned external galleries
refactor code so gallery display defaults to thumbnails square if not slideshow
modify behat test

Change-Id: I3a044bb14713baa3f39732364ee4b46f97f5966b
Signed-off-by: Lisa Seeto <lisaseeto@catalyst.net.nz>